Ingo Molnar wrote:
> chunksize does have an important meaning in the linear case: it's
> 'rounding'. We cannot change this unilaterally (it breaks backwards
What is "rounding" mean in the linear case? Is this the rounding of each partition
that is part of the MD drive?
>
> compatibility), and it does make sense i believe. [certain disks serve
> requests faster which have proper alignment and size. I do not think we
> should assume that an arbitrarily misaligned IO request will perform
This sounds like something that is very drive specific and probably not easily
determined. I doubt that "chunksize" is very useful these days for tuning drive read
and write requests when the actual layout of the drive is hidden from external view
and large RAM caches are the order of the day.
I don't understand why variable "chunksize" is required for linear drives other than
some "backward compatibility" issue - I assume this means that chunksize has been
used for truncating the MD partitions to a particular size. For linear MD, is a
chunksize other than 1 useful? It doesn't seem so to me.
John
